Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 8IQ
If all Hox genes contain the same or very similar homeobox sequences, how can they control different developmental sequences?
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For each of the following, identify whether the statement about Hox genes is true for
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Hox genes are expressed after gap
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genes and pair-rule genes.
What is the function of the Pax 6 gene in the mouse eye reference to HOX gene?
What is positional information? What are three different ways that cells obtain positional information? Which of these ways do you think is the most important for the formation of a segmented body pattern in Drosophila?
Chapter 21 Solutions
Study Guide for Campbell Biology
Ch. 21 - In what ways would third-generation sequencing be...Ch. 21 - Prob. 2IQCh. 21 - Refer to the organisms listed in Table 21.1 in...Ch. 21 - Explain why retrotransposons always move by the...Ch. 21 - For each of the following types of DNA sequences...Ch. 21 - Prob. 6IQCh. 21 - Prob. 7IQCh. 21 - If all Hox genes contain the same or very similar...Ch. 21 - About 25% of the human genome relates to the...Ch. 21 - Prob. 2SYK
Ch. 21 - Which of the following has decreased the time and...Ch. 21 - Prob. 2TYKCh. 21 - In the process called gene annotation, computer...Ch. 21 - Prob. 4TYKCh. 21 - Prob. 5TYKCh. 21 - Prob. 6TYKCh. 21 - What is a pseudogene? a. a gene that has been...Ch. 21 - Prob. 8TYKCh. 21 - Which of the following is common to both...Ch. 21 - Prob. 10TYKCh. 21 - Prob. 11TYKCh. 21 - Prob. 12TYKCh. 21 - Prob. 13TYKCh. 21 - Prob. 14TYKCh. 21 - Compared to genes in mice and chimpanzees, most...
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- Which of the following is NOT true regarding Hox genes. A) The sequence they appear in their corresponding chromosomes is the same order of their expression along the front to back of the developing animal. B) Homologues of the same Hox genes found in flies can be found in humans. C) Hox genes are only found in animals with bilateral symmetry. D) Animals with more complex body plans tend to have more sets of Hox genes through gene duplication events.arrow_forwardWhat is positional information? Discuss three different ways that cells obtain positional information. Which of these three ways do you think is the most important for the formation of a segmented body pattern in Drosophila?arrow_forwardYou have identified a Drosophila gene that is expressed exclusively in the odd-numbered "stripes" in the cellular blastoderm. Assuming that this gene is not redundant, what would be the most likely phenotype cause by a loss-of-function mutation in this gene? an embryo missing odd numbered segments an adult fly with a second pair of wings instead of halteres an embryo with two anterior ends an embryo missing even-numbered segments an embryo missing larval segments 3-10arrow_forward
- Dominguez et al. (2004) suggest that by studying genes that determine growth and tissue specification in the eye of Drosophila, much can be learned about human eye development. (a) What evidence suggests that genetic eye determinants in Drosophila are also found in humans? Include a discussion of orthologous genes in your answer. (b) What evidence indicates that the eyeless gene is part of a developmental network? (c) Are genetic networks likely to specify developmental processes in general? Explain fully and provide an example.arrow_forwardIt seems that developmental genetics boils down to a complex network of gene regulation. Try to draw a structure of this network for Drosophila. How many genes do you think are necessary to complete the developmental network for the fruit fly? How many genes do you think are needed for a network to specify one segment? Do you think it is more difficult to identify genes that are involved in the beginning, middle, or end of this network? Suppose you were trying to identify all of the genes needed for development in a chicken. Knowing what you know about Drosophila development, would you first try to identify genes necessary for early development, or would you begin by identifying genes involved in cell differentiation?arrow_forwardThe human genome does not encode substantially more protein domains than do invertebrate genomes, yet it encodes many more proteins. How are more proteins encoded when the number of domains does not differ substantially?arrow_forward
- What are paralogous and orthologous genes? What are some of the explanations for the finding that humans are a much more complex organism than the roundworm C. elegans, yet have only about 5 percent more protein- coding genes (21,000 versus 20,000)?arrow_forwardA number of genes that control expression of Hox genes in Drosophila have been identified. One of these homozygous mutants is extra sex combs, where some of the head and all of the thorax and abdominal segments develop as the last abdominal segment. In other words, all affected segments develop as posterior segments. What does this phenotype tell you about which set of Hox genes is controlled by the extra sex combs gene?arrow_forwardRunt is a Drosophila gene involved in development. Mutation of runt leads to an embryonic lethal phenotype in which every other segment in the body plan is missing. What class of developmental genes does runt belong to? O a) Pair-rule genes O b) Segment polarity genes Oc) Homeotic genes O d) Gap genesarrow_forward
- In the late 1980s, this gradient hypothesis was united with a genetic approach to the study of Drosophila embryogenesis. If there were gradients, what were the morphogens whose concentrations changed over space?arrow_forwardDominguez et al. (2004) suggest that by studying genes that determine growth and tissue specification in the eye of Drosophila, much can be learned about human eye development. (a) What evidence suggests that genetic eye determinants in Drosophila are also found in humans? Include a discussion of orthologous genes in your answer. (b) What evidence indicates that the eyeless gene is part of a developmental network?arrow_forwardHow is lozenge eye in drosophila an example of pseudoallelism?arrow_forward
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